What Is a Hologram?
A hologram is a physical structure that diffracts light into an image. The term ‘hologram’ can refer to both the encoded material and th
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What Were the First Mirrors?
What Were the First Mirrors? Probably the first mirror was the surface of a quiet pond. Our earliest ancestors must have noticed that they c
What Is a Watermark?
A watermark is an identifying image or pattern in paper which is very useful in the examination of paper as it can be used for dating, ident
How Are the Pictures Formed on Camera Film?
How Are the Pictures Formed on Camera Film? Photographic film is a thin sheet of plastic, coated with special chemicals. Where light rays hi
When Were Mirrors First Used?
We will never know who first discovered the idea of a mirror. But our earliest ancestors must have noticed that they could see their reflect